strspn() -- String Function (libc)

Return length a string includes characters in another
#include <string.h>
unsigned int strspn(string1, string2)
char *string1; char *string2;

strspn() returns  the length for  which string1 initially  consists only of
characters that are found in string2. For example,

    char *s1 = "hello, world";
    char *s2 = "kernighan & ritchie";
    strcspn(s1, s2);

returns  two, which  is the  length  for which  the first  string initially
consists of characters found in the second.

See Also

libc,
string.h
ANSI Standard, §7.11.5.6
POSIX Standard, §8.1

© 2012 by Stephen A. Ness